docs: def get_charset(content_type):
      """Function used to retrieve the charset from a content-type.If there is no
      charset in the content type then the charset defined on DEFAULT_CHARSET
      will be returned
  
      :param  content_type:   A string containing a Content-Type header
      :returns:               A string containing the charset
      """
      if not content_type:
          return DEFAULT_CHARSET
  
      matched = _get_charset_re.search(content_type)
      if matched:
          # Extract the charset and strip its double quotes
          return matched.group('charset').replace('"', '')
      return DEFAULT_CHARSET